Small Engines (Lawn Mowers, etc.): Primer Bulb, gastank, string trimmer

Question
How do I route the gaslines betweet the Primer Buld, the carburator and the gastank when installing a new Primer Buld?

Answer
To give a response, I need to know what type of equipment you have,
and an engine brand or model number.
   If it is a pushmower, the response would be vastly different than if you had a string trimmer, I am guessing it is a trimmer or chainsaw, but I need to know what brand and model,
Thanks
   Fish